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| Phecda (Gamma Ursae Majoris) | |
|---|---|
| Name | Phecda (Gamma Ursae Majoris) |
| Constellation | Ursa Major |
| Apparent magnitude | 2.44 |
| Spectral type | A0Ve |
| Distance pc | 25.2 |
| Other names | Gamma Ursae Majoris, Phecda |
Phecda (Gamma Ursae Majoris) Phecda is a bright star in the Ursa Major asterism, notable for its role in the Big Dipper pattern and for being a nearby A-type main-sequence star. It is cataloged as Gamma Ursae Majoris and has been observed by surveys and missions including Hipparcos, Gaia, HD listings, and ground-based observatories such as Mount Wilson Observatory and Palomar Observatory.
The traditional name "Phecda" derives via medieval Latin and Arabic transmission related to star names preserved by Ptolemy and later compiled in works by Al-Sufi and Ulugh Beg, while alternative historical names appear in catalogs by Johannes Hevelius and John Flamsteed. The Bayer designation "Gamma Ursae Majoris" follows the system introduced by Johann Bayer and appears alongside Flamsteed numbers in catalogues used by European Southern Observatory and institutions such as the Royal Observatory, Greenwich.
Phecda is classified as an A0V or A0Ve star, showing spectral features catalogued in the Henry Draper Catalogue and analyzed in spectroscopic surveys from Mount Wilson Observatory, Lick Observatory, and instruments aboard Hubble Space Telescope. Its apparent magnitude of about 2.44 places it among visible stars listed in charts used by Royal Astronomical Society and amateur groups such as the American Association of Variable Star Observers. Parallax measurements from Hipparcos and refined by Gaia yield a distance near 25 parsecs, used in studies by European Space Agency and cited in databases maintained by SIMBAD and NASA/IPAC. The star's effective temperature, rotational velocity measured via Doppler broadening in analyses by Harvard College Observatory and Kitt Peak National Observatory, and luminosity estimates appear in models by researchers affiliated with Max Planck Institute for Astronomy and California Institute of Technology.
Phecda is part of a multiple-star arrangement: long-term astrometric studies from Mount Wilson Observatory and adaptive optics imaging at Palomar Observatory and Keck Observatory have identified nearby low-mass companions and common-proper-motion objects cataloged in surveys by Two Micron All Sky Survey and Sloan Digital Sky Survey. Radial velocity monitoring programs at European Southern Observatory and McDonald Observatory have constrained potential spectroscopic companions, while speckle interferometry data from Cerro Tololo Inter-American Observatory and University of Cambridge groups contribute to understanding its multiplicity.
Isochrone fitting using stellar evolution codes from groups at Geneva Observatory and Yonsei University places Phecda on the main sequence with an age estimate constrained by comparisons to clusters such as the Ursa Major Moving Group and calibrated against standards used by Harvard-Smithsonian Center for Astrophysics researchers. Models by teams at University of Tokyo and University of Geneva incorporate metallicity and rotation to assess its evolutionary status, and membership analyses involving kinematic data from Gaia and proper motion catalogs maintained by UCAC help refine age estimates via associations with moving groups studied by Royal Observatory of Belgium and Instituto de Astrofísica de Canarias.
Phecda has been recorded in star catalogs since antiquity by observers such as Ptolemy and later by Islamic astronomers including Al-Sufi, appearing in medieval celestial atlases commissioned by patrons like Ulugh Beg and referenced by renaissance cartographers such as Gerardus Mercator. In modern times it has been the subject of photometric monitoring by amateur organizations including American Association of Variable Star Observers and professional campaigns with facilities like Palomar Observatory and European Southern Observatory, and it features in cultural topics covered by museums such as the Smithsonian Institution and planetariums including American Museum of Natural History.
Located in the bowl of the Big Dipper, Phecda occupies a key position used for navigation and star-hopping by observers from institutions like Royal Navy navigators, explorers such as James Cook, and modern amateur groups affiliated with International Astronomical Union. Its coordinates and motion are recorded in astrometric catalogs such as Hipparcos and Gaia and are used in mapping efforts by agencies including the United States Naval Observatory and European Space Agency.
Category:Stars Category:Ursa Major